Need Help Diagnosing Faulty IR Signal on Universal Remote (C
Posted: Thu Jun 05, 2025 3:28 am
Hi all,
I?m currently troubleshooting an old universal remote (model: URC-6131) that?s stopped sending IR signals. The buttons register clicks, and the LED flashes normally, but no signal reaches any of my devices.
Here?s what I?ve tried and observed:
Checked IR LED with a phone camera ? it?s not lighting up.
Measured voltage at the emitter ? fluctuates briefly, then drops.
Swapped out the two electrolytic caps near the output circuit ? no change.
Crystal oscillator seems intact but not sure how to confirm it's still functioning correctly.
Could this be a failed transistor or crystal issue? Or something upstream with the microcontroller?s output?
Any help or common failure insights would be greatly appreciated. I have basic soldering gear and a multimeter, and I?m comfortable replacing small components if needed.
Thanks in advance!
I?m currently troubleshooting an old universal remote (model: URC-6131) that?s stopped sending IR signals. The buttons register clicks, and the LED flashes normally, but no signal reaches any of my devices.
Here?s what I?ve tried and observed:
Checked IR LED with a phone camera ? it?s not lighting up.
Measured voltage at the emitter ? fluctuates briefly, then drops.
Swapped out the two electrolytic caps near the output circuit ? no change.
Crystal oscillator seems intact but not sure how to confirm it's still functioning correctly.
Could this be a failed transistor or crystal issue? Or something upstream with the microcontroller?s output?
Any help or common failure insights would be greatly appreciated. I have basic soldering gear and a multimeter, and I?m comfortable replacing small components if needed.
Thanks in advance!